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Thanks for all the answers. I got it working eventually by setting up a CentOS installation on a USB drive. I setup CentOS DomU with virtual machine manager (other than that was the same as the DomU on the Dom0 Ubuntu). I did a comparison of what it was doing compared with my Ubuntu Dom0 generated CentOS DomU.

Things I was missing were:-

vfb = [ "type=vnc,vncunused=1" ] in the config file

At this point VNC started to listen but just gave a black screen when vncviewer was launched.

In my grub.conf there was a "console=xvc" line or similar which was stopping the boot messages appearing in the VNC console.

Now I could boot and read the boot messages in VNC (and xm console!) but no login prompt.

Lastly, I re-enabled the line for in inittab for tty01, as I noticed that it was commented out in the DomU I created in using "xm console", which allowed to

So at this point both DomU's were behaving the same way. I went back to Ubuntu and applied the fixes and then (apart from some odd colouring) it all seemed to work okay.

Was a bit disappointed that I couldn't see the pyGRUB output, but I am guessing that may be impossible otherwise CentOS would be doing it out the box.

Thanks again.

From: Boris Derzhavets <bderzhavets@xxxxxxxxx>
To: xen-users@xxxxxxxxxxxxxxxxxxx; Ian Murray <murrayie@xxxxxxxxxxx>
Sent: Monday, 27 October, 2008 6:11:19
Subject: Re: [Xen-users] VNC access console of paravirtualised DomU

--- On Sun, 10/26/08, Ian Murray <murrayie@xxxxxxxxxxx> wrote:

From: Ian Murray <murrayie@xxxxxxxxxxx>
Subject: [Xen-users] VNC access console of paravirtualised DomU
To: xen-users@xxxxxxxxxxxxxxxxxxx
Date: Sunday, October 26, 2008, 7:49 AM

Hi,

I've seen this asked a few times, but I just can't work out whether I am misinterpreting how this is supposed to work, or if it is just broken in my setup.

What I want is to be able to see the character cell console of DomU's via VNC. As far as I understand, when I create/startup the DomU, then a vnc server should start listening on my Dom0. I have tried every combination of VNC=1, VNCVIEWER=0 in my config file but at no point do I get a VNC port being opened for listening on the Dom0. Dom0 is Hardy Heron, DomU's are Centos 5.2 and Hardy.
***********************************************************
At CentOS 5.2 DomU vfb works fine:-

http://bderzhavets.wordpress.com/2008/10/20/pygrub-install-centos-52-pv-domu-at-xen-32-ubuntu-hardy-dom0-via-local-http-server-all-64-bit/

View:-
http://blog.bashton.com/2008/running-an-ubuntu-hardy-xen-domu-under-a-centos-dom0/
Personally, i failed when followed link above to get graphical login via vfb
as advised above and just set it up in Hardy DomU:-

http://bderzhavets.blogspot.com/2008/10/install-ubuntu-hardy-pv-domu-vnc-at.html
**********************************************************
All the Xen kernel and tools were as was provided by the repositories. When I was trying this a while ago with Centos 5.1 as the Dom0, I was using virtual machine manager which seemed to give me a colourful representation of the console/, which I assume now was over VNC. I haven't got that setup anymore to reference, alas and virtual-machine-manager seems broken on Hardy, afa I can tell.

So, am I missing something or is it supposed to work the way I described? If so, what should I have in my config files/sxp to make it work?

Thanks in advance and be gentle with me because I am a noob Xen user!

Ian.
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